What kind of numbers did arabic numbers replace?

The Roman numeral system of numbers spread as the Roman Empire grew. The Roman number system began around 3 B. C., but the older Arabic number system with decimals and a zero replaced it.Source:Hi...
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Are the numbers on the back of the Social Security card the
routing numbers for the Federal Reserve?

Newer cards issued by the Social Security Administration have a red number printed on the back. Rumors state that these numbers signify a routing or account number within the Federal Reserve bankin...
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